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Knocking sound

Tiny
JIMPSE
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 61,000 MILES
Have a 2000 chevy silverado with a 5.3 motor. When I start it when its cold it makes a slight knocking sound when I put it in drive for about five seconds and then it goes away. Only does it when its cold. Never when it s warm. And it doesnt do it when it is in park. Any ideas?
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Sunday, December 26th, 2010 AT 6:32 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If the noise is coming from the upper end of the engine -could be a lifter leakdown problem-try engine flush and see what happens
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Sunday, December 26th, 2010 AT 7:19 PM
Tiny
JIMPSE
  • MEMBER
  • 2 POSTS
I am a little leary about an engine flush. Ive read a lot of horror stories about them. Any other ideas besides replacing the lifters?
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Monday, December 27th, 2010 AT 1:37 PM

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